“Fair market value” is the key here. “Fair market value” is easily manipulated. Just how close to the non-family business would keep it in the “fair market” concept. Cars in the same class sell at widely different prices. Self dealing should be prohibited. That’s obvious. To verify that a candidate is enriching himself or herself at supporters expense would take serious auditing and, since that will be expensive, it will forever be easily open to abuse. Let’s get the money out of politics.